Tunnel support structure and its construction method

Abstract

The present invention discloses a tunnel support structure and a construction method thereof, wherein the tunnel support structure comprises at least one segment ring assembly and concrete, the segment ring assembly is suitable for being arranged on the inner wall of the tunnel, the segment ring assembly comprises an inner ring support assembly and an outer ring support assembly, the inner ring support assembly is connected with the outer ring support assembly and enclosed to form a grouting cavity; concrete is injected into the grouting cavity. The present invention proposes a tunnel support structure, which can be applied to TBM construction, improves the installation convenience of the support structure, improves the force performance, and reduces the safety risk of tunnel construction.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel engineering support structures, and in particular to a tunnel support structure and a construction method thereof. Background Art

[0002] In tunnel construction, TBM (Tunnel Boring Machine) construction has the characteristics of high degree of automation, fast construction speed, manpower saving, safety and economy, and has been widely tried and applied in large-scale tunnel projects.

[0003] Among them, the segment structure suitable for TBM excavation of deep buried tunnels is a major technical difficulty. At present, the support structure of tunnel engineering mostly adopts reinforced concrete segments. This support structure is relatively complex and the construction difficulty is relatively high. Summary of the invention

[0004] The main purpose of the present invention is to provide a tunnel support structure and a construction method thereof, aiming to improve the construction convenience of the tunnel support structure.

[0005] To achieve the above object, the present invention provides a tunnel support structure, which includes:

[0006] At least one segment ring assembly, suitable for being arranged on the inner wall of the tunnel, the segment ring assembly comprising an inner ring support assembly and an outer ring support assembly, the inner ring support assembly being connected to the outer ring support assembly and enclosing a grouting cavity; and

[0007] Concrete is injected into the grouting cavity.

[0008] Optionally, the inner ring support assembly comprises a plurality of inner ring steel plates, and the plurality of inner ring steel plates are spliced ​​in sequence along the tunnel circumferential direction;

[0009] The outer ring support assembly comprises a plurality of outer ring steel plates, and the plurality of outer ring steel plates are spliced ​​in sequence along the tunnel circumference;

[0010] Wherein, the plurality of inner ring steel plates are connected and fixed one-to-one with the plurality of outer ring steel plates.

[0011] Optionally, a grouting port connected to the grouting cavity is provided on the inner ring steel plate.

[0012] Optionally, each of the inner ring steel plates is arranged in an arch shape and has two opposite arc edges and two opposite side edges;

[0013] The inner ring support assembly also includes:

[0014] Inner ring splicing plates, both sides of the inner ring steel plate are provided with the inner ring splicing plates, and the two inner ring splicing plates adjacent to each other in the tunnel ring direction are spliced ​​with each other.

[0015] Optionally, the inner ring support assembly further includes:

[0016] The inner ring stiffening rib is arranged on the inner ring steel plate to enhance its bending rigidity.

[0017] Optionally, the number of the inner ring stiffening ribs is multiple groups, and the multiple groups of inner ring stiffening ribs are evenly spaced along the width direction of the inner ring steel plate, and two groups of the inner ring stiffening ribs are respectively arranged on two arc edges of the inner ring steel plate;

[0018] Each group of the inner ring stiffening ribs includes a plurality of the inner ring stiffening ribs, and the plurality of the inner ring stiffening ribs are evenly arranged along the circumferential direction of the inner ring steel plate.

[0019] Optionally, each of the outer ring steel plates is arranged in an arch shape and has two opposite arc edges and two opposite side edges;

[0020] The outer ring support assembly also includes:

[0021] The outer ring splicing plate is arranged on the side of the outer ring steel plate, and the two outer ring splicing plates adjacent to each other in the tunnel ring direction are spliced ​​together.

[0022] Optionally, the outer ring support assembly also includes:

[0023] a web plate, provided on the outer ring steel plate and extending in the radial direction of the tunnel; and

[0024] A radial splicing plate is arranged at the end of the web, and the radial splicing plate is connected and fixed to the inner ring steel plate.

[0025] Optionally, there are two webs, and the two webs are spaced apart and arranged on the outer ring steel plate.

[0026] Optionally, the outer ring support assembly further includes:

[0027] The outer ring stiffening ribs are arranged on the outer ring steel plate to enhance its bending rigidity.

[0028] Optionally, the outer ring stiffening ribs are provided in multiple groups, and the multiple groups of the outer ring stiffening ribs are evenly spaced along the width direction of the outer ring steel plate, and two groups of the outer ring stiffening ribs are respectively provided on two arc edges of the outer ring steel plate;

[0029] Each group of the outer ring stiffening ribs includes a plurality of the outer ring stiffening ribs, and the plurality of the outer ring stiffening ribs are evenly arranged along the circumferential direction of the outer ring steel plate.

[0030] Optionally, the two outer ring steel plates adjacent to each other in the length direction of the tunnel are fixed by welding, and the two outer ring steel plates adjacent to each other in the circumferential direction of the tunnel are fixed by bolt connection;

[0031] The two inner ring steel plates adjacent to each other along the length direction of the tunnel are fixed by welding, and the two inner ring steel plates adjacent to each other along the circumferential direction of the tunnel are fixed by bolt connection; the inner ring steel plate and the outer ring steel plate radially opposite to it are fixed by bolt connection.

[0032] Optionally, shear connectors are provided on the outer ring steel plate and / or the inner ring steel plate.

[0033] Optionally, in the length direction of the tunnel, two adjacent segment ring assemblies are staggered.

[0034] Optionally, the phase difference between two adjacent support ring assemblies is 10°-50°.

[0035] Optionally, the number of the segment ring assemblies is 6, and each segment ring assembly has 6 inner ring steel plates and 6 outer ring steel plates.

[0036] In order to achieve the above object, the present invention further proposes a construction method of a tunnel support structure, based on the tunnel support structure as described above, comprising the following steps:

[0037] Splicing the plurality of outer ring steel plates in sequence along the tunnel circumferential direction, and then splicing the plurality of inner ring steel plates in sequence along the tunnel circumferential direction and connecting and fixing them one-to-one with the plurality of outer ring steel plates to assemble the segment ring assembly;

[0038] The concrete is injected into the grouting cavity, and after the concrete is hardened and formed, a steel plate-concrete composite segment structure is formed.

[0039] Optionally, after the steps of sequentially splicing the plurality of outer ring steel plates along the tunnel circumferential direction, sequentially splicing the plurality of inner ring steel plates along the tunnel circumferential direction and connecting and fixing them one-to-one with the plurality of outer ring steel plates to assemble the segment ring assembly, the step further includes:

[0040] Taking the constructed segment ring assembly as a reference, continue to splice the next segment ring assembly to assemble the segment ring assembly of the target length and form a concrete formwork.

[0041] In the technical solution of the present invention, the tunnel support structure includes at least one segment ring assembly and concrete. The segment ring assembly is suitable for being arranged on the inner wall of the tunnel. The segment ring assembly includes an inner ring support assembly and an outer ring support assembly. The inner ring support assembly is connected to the outer ring support assembly and encloses a grouting cavity; concrete is injected into the grouting cavity. It can be understood that during construction, the inner ring support assembly and the outer ring support assembly can be installed to the inner wall of the tunnel respectively, and then concrete is injected into the grouting cavity. The support structure can be completed by segmented construction, which improves the construction convenience of the tunnel support structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0043] Figure 1 It is a schematic diagram of the local structure of an embodiment of a tunnel support structure of the present invention;

[0044] Figure 2 A schematic structural diagram of an embodiment of a tunnel support structure of the present invention;

[0045] Figure 3 It is a schematic diagram of the structure of the inner ring steel plate in one embodiment of the tunnel support structure of the present invention;

[0046] Figure 4 This is a schematic diagram of the structure of the outer ring steel plate in one embodiment of the tunnel support structure of the present invention;

[0047] Figure 5 The figure is a flow chart of an embodiment of a construction method of a tunnel support structure of the present invention.

[0048] Description of Figure Numbers:

[0049] 10. Segment ring assembly; 20. Concrete; 11. Inner ring support assembly; 12. Outer ring support assembly; 110. Inner ring steel plate; 111. Inner ring stiffening rib; 112. Inner ring splicing plate; 120. Outer ring steel plate; 121. Outer ring stiffening rib; 122. Outer ring splicing plate; 123. Web plate; 124. Shear connector; 125. Radial splicing plate.

[0050] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0053] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text is to include three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or a solution that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0054] In order to improve the construction convenience of a tunnel support structure, the present invention proposes a tunnel support structure, which can be applied to various underground space structures, but is not limited here.

[0055] Reference Figure 1 and Figure 2 In one embodiment of the present invention, the tunnel support structure includes at least one segment ring assembly 10 and concrete 20. The segment ring assembly 10 is suitable for being arranged on the inner wall of the tunnel. The segment ring assembly 10 includes an inner ring support assembly 11 and an outer ring support assembly 12. The inner ring support assembly 11 is connected to the outer ring support assembly 12 and is surrounded to form a grouting cavity; the concrete 20 is injected into the grouting cavity.

[0056] In this embodiment, the concrete formwork is formed by an inner ring support assembly 11 and an outer ring support assembly 12, which may include one or more segment ring assemblies 10, and a reasonable number can be selected according to the length of the target construction section. The length of the tunnel support structure is not limited here.

[0057] In this embodiment, the inner ring support assembly 11 and the outer ring support assembly 12 can both be assembled from multiple metal plates such as steel plates or aluminum alloy plates, and can be arranged in a ring shape or an arch shape. The space between the inner ring support assembly 11 and the outer ring support assembly 12 is the grouting cavity, and the grouting cavity can be arranged in a ring shape or an arch shape, which is not limited here.

[0058] It should be noted that the concrete 20 in this embodiment may be self-compacting concrete or ordinary concrete, etc., which is not specifically limited here.

[0059] Among them, self-compacting concrete (Self-Compacting Concrete or Self-Consolidating Concrete, referred to as SCC) refers to concrete that can flow and compact under its own gravity, can completely fill the formwork even in the presence of dense steel bars, and has good homogeneity, and does not require additional vibration. Self-compacting concrete has the following advantages: 1. Ensure that the concrete is well compacted; 2. Improve production efficiency. Since no vibration is required, the time required for concrete pouring is greatly shortened, the labor intensity of workers is greatly reduced, and the number of workers required is reduced; 3. Improve the working environment and safety, there is no vibration noise, and avoid the "hand vibration syndrome" caused by workers holding the vibrator for a long time; 4. Improve the surface quality of concrete. There will be no surface bubbles or honeycomb pockmarks, and no surface repair is required; it can realistically present the texture or shape of the formwork surface. 5. It increases the freedom of structural design. It does not require vibration and can cast structures with complex shapes, thin walls and dense reinforcement. In the past, such structures were often limited due to the difficulty of concrete pouring construction. 6. It avoids the wear of the formwork caused by vibration. 7. It reduces the wear of concrete on the mixer. 8. It may reduce the overall cost of the project, reducing costs from many aspects such as increasing construction speed, limiting environmental noise, reducing labor and ensuring quality.

[0060] In this technical solution, the tunnel support structure includes at least one segment ring assembly 10 and concrete 20. The segment ring assembly 10 is suitable for being arranged on the inner wall of the tunnel. The segment ring assembly 10 includes an inner ring support assembly 11 and an outer ring support assembly 12. The inner ring support assembly 11 is connected to the outer ring support assembly 12 and encloses a grouting cavity; the concrete 20 is injected into the grouting cavity. It can be understood that during construction, the inner ring support assembly 11 and the outer ring support assembly 12 can be installed to the inner wall of the tunnel respectively, and then the concrete 20 is injected into the grouting cavity. The support structure can be completed by segmented construction, which improves the construction convenience of the tunnel support structure. In addition, this tunnel support structure can be suitable for TBM construction, has good stress performance, and has broad application prospects.

[0061] It is worth mentioning that this support structure can ensure that the deformation under the impact of rock burst load meets the construction safety requirements, which improves the safety of tunnel construction to a certain extent.

[0062] In order to further improve the construction convenience of the tunnel support structure, in one embodiment, referring to Figures 1 to 4 The inner ring support assembly 11 may include a plurality of inner ring steel plates 110, which are sequentially spliced ​​along the tunnel circumferential direction. The outer ring support assembly 12 may include a plurality of outer ring steel plates 120, which are sequentially spliced ​​along the tunnel circumferential direction; wherein the plurality of inner ring steel plates 110 are connected and fixed to the plurality of outer ring steel plates 120 one by one.

[0063] In this embodiment, since the inner ring support assembly 11 and the outer ring support assembly 12 are both made of multiple steel plates spliced ​​together, the steel plates can be transported into the tunnel, and then the inner ring support assembly 11 and the outer ring support assembly 12 can be installed in sequence, which can greatly improve the construction efficiency, shorten the construction period, and also facilitate loading and transportation.

[0064] Reference Figure 1 and Figure 2 In some embodiments, a grouting port connected to the grouting cavity may be provided on the inner ring steel plate 110 to introduce concrete 20 into the grouting cavity. In this way, the construction efficiency can be improved and the construction period of the tunnel support structure can be shortened.

[0065] In order to reduce the gap between two adjacent inner ring steel plates 110, improve the waterproof performance of the tunnel support structure, and facilitate construction, in some embodiments, refer to Figures 1 to 3 Each inner ring steel plate 110 may be arranged in an arch shape and have two opposite arc edges and two opposite side edges. Figure 3 As shown, the inner ring support assembly 11 may also include two inner ring splicing plates 112. The two inner ring splicing plates 112 are respectively arranged on both sides of the inner ring steel plate 110, and the two inner ring splicing plates 112 adjacent to each other in the tunnel ring direction are spliced ​​together.

[0066] In this embodiment, the connection method between two adjacent inner ring splicing plates 112 can be bolt connection, screw connection, rivet connection or welding, etc., or a combination of two or more connection methods, which is not limited here.

[0067] Further, in one embodiment, if Figure 3 As shown, the inner ring support assembly may further include inner ring stiffening ribs 111, and the inner ring stiffening ribs 111 are arranged on the inner ring steel plate 110 to enhance its bending rigidity.

[0068] In this embodiment, there are multiple groups of inner ring stiffening ribs 111, which are evenly arranged along the width direction of the inner ring steel plate 110, and two groups of inner ring stiffening ribs 111 are arranged on the two arc edges of the inner ring steel plate 110; each group of inner ring stiffening ribs 111 includes multiple inner ring stiffening ribs 111, which are evenly arranged along the circumferential direction of the inner ring steel plate 110. Such an arrangement can make the inner ring steel plate 110 meet the force requirements, thereby greatly improving the force performance of the entire support structure.

[0069] For the same purpose, in some embodiments, such as Figure 4As shown, each outer ring steel plate 120 can also be arranged in an arched shape and have two opposite arc edges and two opposite side edges. The outer ring support assembly 12 can include an outer ring splicing plate 122, which is arranged on the side of the outer ring steel plate 120, and two outer ring splicing plates 122 adjacent to each other in the tunnel ring direction are spliced ​​together.

[0070] It should also be noted that in this embodiment, the connection method between the two adjacent outer ring splicing plates 122 can also be bolt connection, screw connection, rivet connection or welding, etc., or a combination of two or more connection methods, which is not limited here.

[0071] In order to achieve the connection between the inner ring steel plate 110 and the outer ring steel plate 120 and improve the radial stiffness of the overall structure, in one embodiment, referring to Figure 1 and Figure 2 The outer ring support assembly 12 may also include a web 123 and a radial splicing plate 125. The web 123 is arranged on the outer ring steel plate 120 and extends radially along the tunnel. The radial splicing plate 125 is arranged at the end of the web 123. The web 123 and the inner ring steel plate 110 are connected and fixed by the radial splicing plate 125.

[0072] In this embodiment, the web 123 and the outer ring steel plate 120 can be integrally formed and manufactured, or connected and fixed by welding, threading or riveting, etc., and the radial splicing plate 125 and the web 123 can also be integrally formed and manufactured, or connected and fixed by welding, threading or riveting, etc., which are not specifically limited here. In this embodiment, the radial splicing plate 125 and the inner ring steel plate 110 can be preferably bolted to facilitate disassembly and assembly, thereby improving construction efficiency.

[0073] In order to facilitate the assembly of the segment ring assembly 10 and improve the construction efficiency, in some embodiments, referring to Figure 1 and Figure 2 The two outer ring steel plates 120 adjacent to each other in the tunnel length direction can be fixed by welding, and the two outer ring steel plates 120 adjacent to each other in the tunnel circumferential direction can also be fixed by bolt connection. The two inner ring steel plates 110 adjacent to each other in the tunnel length direction can be fixed by welding, and the two inner ring steel plates 110 adjacent to each other in the tunnel circumferential direction can also be fixed by bolt connection; the inner ring steel plate 110 and the outer ring steel plate 120 radially opposite to it are fixed by bolt connection.

[0074] Furthermore, if Figure 4 As shown, in this embodiment, the number of the webs 123 can be two, and the two webs 123 are spaced apart on the outer ring steel plate 120 to further improve the radial stiffness of the overall structure and enhance the reliability of the entire support structure.

[0075] Of course, in some other embodiments, fewer or more webs 123 may be provided on the outer ring steel plate 120 , which is not limited here.

[0076] In order to improve the bending stiffness of the tunnel support structure, so as to improve the stress bearing performance and make it have better rock burst resistance, in one embodiment, Figure 4 As shown, the outer ring support assembly 12 may further include an outer ring stiffening rib 121 , and the outer ring stiffening rib 121 is disposed on the outer ring steel plate 120 to enhance its bending rigidity.

[0077] In this embodiment, at least one outer ring stiffening rib 121 is provided on the outer ring steel plate 120 , and at least one inner ring stiffening rib 111 may also be provided on the inner ring steel plate 110 , which is not limited here.

[0078] In this embodiment, Figure 4 As shown, the number of the outer ring stiffening ribs 121 can be multiple groups, and the multiple groups of outer ring stiffening ribs 121 are evenly arranged along the width direction of the outer ring steel plate 120, and two groups of outer ring stiffening ribs 121 are respectively arranged on the two arc edges of the outer ring steel plate 120; each group of outer ring stiffening ribs 121 includes multiple outer ring stiffening ribs 121, and the multiple outer ring stiffening ribs 121 are evenly arranged along the circumferential direction of the outer ring steel plate 120. Such an arrangement can achieve better force bearing performance.

[0079] In order to improve the stability of the segment unit during the construction phase and the overall performance of the combined segment structure during the use phase, and to make it have better rock burst resistance, in one embodiment, reference is made to Figure 3 and Figure 4 The outer ring steel plate 120 and / or the inner ring steel plate 110 are provided with a shear connector 124.

[0080] The shear connector 124 may be a bolt or the like, which is not limited here.

[0081] Please refer to Figure 2 In some embodiments, two adjacent segment ring assemblies 10 are staggered in the tunnel length direction. In this way, the longitudinal rigidity of the tunnel support structure can be improved, the displacement can be reduced, and the overall stability can be improved.

[0082] In order to facilitate construction and shorten the construction period, the tunnel support structure can adopt the segmented construction method. Figure 2 The number of the segment ring assemblies 10 may be 6, and each segment ring assembly 10 has 6 inner ring steel plates 110 and 6 outer ring steel plates 120.

[0083] Of course, in some other embodiments, the tunnel support structure may also use fewer or more segment ring assemblies 10, and each segment ring assembly 10 may use fewer or more inner ring steel plates 110 and outer ring steel plates 120, and the specific design may be adapted according to the actual size of the tunnel under construction.

[0084] In this embodiment, the phase difference between two adjacent segment ring assemblies 10 can be set to 10°-50°, so as to facilitate construction and improve the stability of the tunnel support structure.

[0085] Among them, preferably, when the phase difference is 30°, and when the distance between the two webs 123 is equal to twice the distance between each web 123 and the side of the adjacent outer ring steel plate 120, it can be ensured that 12 connected grouting cavities are formed, so that the concrete can flow fully in the grouting cavity after being injected, so that the support structure can achieve better stability.

[0086] The present invention also proposes a construction method of a tunnel support structure, and the construction method of the tunnel support structure is based on the above-mentioned tunnel support structure.

[0087] refer to Figure 5 In one embodiment of the present invention, the construction method of the tunnel support structure comprises the following steps:

[0088] Step S10, splicing the plurality of outer ring steel plates in sequence along the tunnel circumferential direction, and then splicing the plurality of inner ring steel plates in sequence along the tunnel circumferential direction and connecting and fixing them one-to-one with the plurality of outer ring steel plates to assemble the segment ring assembly;

[0089] Step S20, injecting the concrete into the grouting cavity, and forming a steel plate-concrete composite segment structure after the concrete is hardened and formed.

[0090] During construction, multiple inner ring steel plates and outer ring steel plates and other components can be transported to the construction site. When installing multiple inner ring steel plates and outer ring steel plates in sequence, they can be spliced ​​in a counterclockwise or clockwise direction to assemble a segment ring assembly; of course, in order to shorten the construction period, construction can also be carried out from two ends or multiple places at the same time to assemble the segment ring assembly. Then, on the basis of the constructed segment ring assembly, the target number of segment ring assemblies are installed to achieve the target length of the concrete formwork, that is, the assembly of the support structure frame is completed.

[0091] In this embodiment, the connection between the inner ring steel plates can be bolt connection, screw connection, rivet connection or welding, etc., or a combination of two or more connection methods, which is not limited here. Similarly, the connection between the outer ring steel plates can be bolt connection, screw connection, rivet connection or welding, etc., or a combination of two or more connection methods, which is not limited here.

[0092] It should be noted that concrete can be introduced from the grouting port inside the ring into the closed space between the inner ring steel plate and the outer ring steel plate, that is, the grouting cavity. In this embodiment, the concrete can be ordinary concrete or self-compacting concrete, etc., which is not specifically limited here.

[0093] Furthermore, after the steps of sequentially splicing the plurality of outer ring steel plates along the tunnel circumferential direction, sequentially splicing the plurality of inner ring steel plates along the tunnel circumferential direction and connecting and fixing them one-to-one with the plurality of outer ring steel plates to assemble the segment ring assembly, the method may further include:

[0094] Step S11, taking the constructed segment ring assembly as a reference, continue to splice the next segment ring assembly to assemble the segment ring assembly of the target length and form a concrete formwork.

[0095] In this embodiment, the outer ring steel plate can be first welded to the outer ring steel plate of the existing segment ring assembly or connected and fixed to the tunnel concrete structure, and then the inner ring steel plate can be bolted to the inner ring steel plate of the existing segment ring assembly in sequence, and then bolted to the outer ring steel plate. Then, the outer ring steel plate can be bolted to the outer ring steel plate of the outer ring support assembly in sequence, welded to the outer ring steel plate of the existing segment ring assembly, and the inner ring steel plate can be bolted to the inner ring steel plate of the existing segment ring assembly in sequence, and then bolted to the outer ring steel plate, and then bolted to the inner ring steel plate of the inner ring support assembly in an annular direction. Next, the target number of segment ring assemblies are positioned and installed in sequence to complete the installation of the concrete formwork.

[0096] It should be noted that when there is no supporting structure in the previous construction section, the segment ring assembly can be directly built in the current construction section without positioning. The first segment ring assembly can be installed by setting up a scaffolding, and then the remaining segment ring assemblies can be positioned and installed.

[0097] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A tunnel support structure, characterized in that: The tunnel support structure comprises: At least one segment ring assembly is suitable for being arranged on the inner wall of the tunnel, the segment ring assembly comprises an inner ring support assembly and an outer ring support assembly, the inner ring support assembly is connected to the outer ring support assembly and is arranged to form a grouting cavity; the inner ring support assembly comprises a plurality of inner ring steel plates, and the plurality of inner ring steel plates are spliced ​​in sequence along the circumferential direction of the tunnel; the outer ring support assembly comprises a plurality of outer ring steel plates, an outer ring splicing plate, a web plate and a radial splicing plate, and the plurality of outer ring steel plates are spliced ​​in sequence along the circumferential direction of the tunnel; the plurality of inner ring steel plates are connected and fixed one-to-one with the plurality of outer ring steel plates, and each of the inner ring steel plates is arranged in an arch shape and has two opposite arc edges and two opposite side edges; the The inner ring support assembly also includes an inner ring splicing plate, both sides of the inner ring steel plate are provided with the inner ring splicing plates, and the two inner ring splicing plates adjacent to each other in the tunnel ring direction are spliced ​​together; each of the outer ring steel plates is arranged in an arch shape and has two opposite arc edges and two opposite side edges; the outer ring splicing plate is arranged on the side of the outer ring steel plate, and the two outer ring splicing plates adjacent to each other in the tunnel ring direction are spliced ​​together; the web is arranged on the outer ring steel plate and extends radially along the tunnel; the radial splicing plate is arranged at the end of the web, and the radial splicing plate is connected and fixed to the inner ring steel plate; the number of the webs is two, and the two webs are arranged on the outer ring steel plate at intervals; In the tunnel length direction, two adjacent segment ring assemblies are staggered, the phase difference between the two adjacent segment ring assemblies is 30°, and the distance between the two webs is equal to twice the distance between each web and the adjacent side of the outer ring steel plate; and Concrete is injected into the grouting cavity.

2. The tunnel support structure according to claim 1, characterized in that: The inner ring steel plate is provided with a grouting port connected to the grouting cavity.

3. The tunnel support structure according to claim 1, characterized in that: The inner ring support assembly also includes: The inner ring stiffening rib is arranged on the inner ring steel plate to enhance its bending rigidity.

4. The tunnel support structure according to claim 3, characterized in that: The inner ring stiffening ribs are in multiple groups, and the multiple groups of inner ring stiffening ribs are evenly spaced along the width direction of the inner ring steel plate, and two groups of the inner ring stiffening ribs are respectively arranged on the two arc edges of the inner ring steel plate; Each group of the inner ring stiffening ribs includes a plurality of the inner ring stiffening ribs, and the plurality of the inner ring stiffening ribs are evenly arranged along the circumferential direction of the inner ring steel plate.

5. The tunnel support structure according to claim 1, characterized in that: The outer ring support assembly also includes: The outer ring stiffening ribs are arranged on the outer ring steel plate to enhance its bending rigidity.

6. The tunnel support structure according to claim 5, characterized in that: The outer ring stiffening ribs are in multiple groups, and the multiple groups of the outer ring stiffening ribs are evenly spaced along the width direction of the outer ring steel plate, and two groups of the outer ring stiffening ribs are respectively arranged on the two arc edges of the outer ring steel plate; Each group of the outer ring stiffening ribs includes a plurality of the outer ring stiffening ribs, and the plurality of the outer ring stiffening ribs are evenly arranged along the circumferential direction of the outer ring steel plate.

7. The tunnel support structure according to claim 1, characterized in that: The two outer ring steel plates adjacent to each other in the length direction of the tunnel are fixed by welding, and the two outer ring steel plates adjacent to each other in the circumferential direction of the tunnel are fixed by bolt connection; The two inner ring steel plates adjacent to each other along the length direction of the tunnel are fixed by welding, and the two inner ring steel plates adjacent to each other along the circumferential direction of the tunnel are fixed by bolt connection; the inner ring steel plate and the outer ring steel plate radially opposite to it are fixed by bolt connection.

8. The tunnel support structure according to claim 1, characterized in that: The outer ring steel plate and / or the inner ring steel plate are provided with shear connectors.

9. The tunnel support structure according to claim 1, characterized in that: The number of the segment ring assemblies is 6, and each segment ring assembly has 6 inner ring steel plates and 6 outer ring steel plates.

10. A construction method of a tunnel support structure, based on the tunnel support structure according to any one of claims 1 to 9, characterized in that: The following steps are involved: Splicing the plurality of outer ring steel plates in sequence along the tunnel circumferential direction, and then splicing the plurality of inner ring steel plates in sequence along the tunnel circumferential direction and connecting and fixing them one-to-one with the plurality of outer ring steel plates to assemble the segment ring assembly; The concrete is injected into the grouting cavity, and after the concrete is hardened and formed, a steel plate-concrete composite segment structure is formed.

11. The construction method of the tunnel support structure according to claim 10, characterized in that: After the steps of sequentially splicing the plurality of outer ring steel plates along the tunnel circumferential direction, and then sequentially splicing the plurality of inner ring steel plates along the tunnel circumferential direction and connecting and fixing them one-to-one with the plurality of outer ring steel plates to assemble the segment ring assembly, the step further includes: Taking the constructed segment ring assembly as a reference, continue to splice the next segment ring assembly to assemble the segment ring assembly of the target length and form a concrete formwork.

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